Get Algebraic Geometry in Coding Theory and Cryptography PDF

By Harald Niederreiter

ISBN-10: 0691102880

ISBN-13: 9780691102887

This textbook equips graduate scholars and complicated undergraduates with the mandatory theoretical instruments for utilizing algebraic geometry to details idea, and it covers fundamental functions in coding idea and cryptography. Harald Niederreiter and Chaoping Xing give you the first targeted dialogue of the interaction among nonsingular projective curves and algebraic functionality fields over finite fields. This interaction is prime to analyze within the box this present day, but beforehand no different textbook has featured entire proofs of it. Niederreiter and Xing disguise classical purposes like algebraic-geometry codes and elliptic-curve cryptosystems in addition to fabric now not taken care of through different books, together with function-field codes, electronic nets, code-based public-key cryptosystems, and frameproof codes. Combining a scientific improvement of concept with a huge number of real-world purposes, this is often the main accomplished but available advent to the sphere available.Introduces graduate scholars and complicated undergraduates to the principles of algebraic geometry for functions to info thought presents the 1st particular dialogue of the interaction among projective curves and algebraic functionality fields over finite fields comprises functions to coding concept and cryptography Covers the most recent advances in algebraic-geometry codes gains functions to cryptography now not handled in different books

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Algebraic Geometry in Coding Theory and Cryptography by Harald Niederreiter PDF

This textbook equips graduate scholars and complicated undergraduates with the required theoretical instruments for employing algebraic geometry to info thought, and it covers basic functions in coding idea and cryptography. Harald Niederreiter and Chaoping Xing give you the first targeted dialogue of the interaction among nonsingular projective curves and algebraic functionality fields over finite fields.

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Extra resources for Algebraic Geometry in Coding Theory and Cryptography

Example text

Assume that the lemma is true for n − 1 distinct places for some n ≥ 3. By this hypothesis, there exists w ∈ F such that νP1 (w) > 0 and νPi (w) < 0 for 2 ≤ i ≤ n − 1. There also exists y ∈ F with νP1 (y) > 0 and νPn (y) < 0. If νPn (w) < 0, we take z = w. If νPn (w) ≥ 0, we put z = w + y r with an integer r ≥ 1. Then νP1 (z) > 0, and for 2 ≤ i ≤ n we obtain νPi (z) = min (νPi (w), rνPi (y)) < 0 by choosing r in such a way that the strict triangle inequality applies. 18 (Approximation Theorem).

Then it is obvious that {P } = Z(x1 − a1 , . . , xn − an ). It can be shown that this gives a one-to-one correspondence between the maximal ideals of k[X] and the points of An (k). The following properties are easy to verify. 6. (i) Let S be a nonempty subset of k[X]. If I is the ideal of k[X] generated by S, then Z(I ) = Z(S). (ii) For any two subsets T ⊆ S of k[X], we have Z(S) ⊆ Z(T ). (iii) If {Sj } is any nonempty collection of subsets of k[X], then Z(∪Sj ) = ∩Z(Sj ); so the intersection of any nonempty collection of affine algebraic sets is an affine algebraic set.

6). Since a basis {β1 , . . , βn } of Fq n over Fq is a P integral basis of Fn /F , we can write any element of RQ in the form z(Q), where n z= z i βi i=1 with z 1 , . . , z n ∈ OP . Hence, n z(Q) = n z i (Q)βi = i=1 z i (P )βi ∈ FP · Fq n , i=1 showing that RQ = FP · Fq n . This yields deg(Q) = [RQ : Fq n ] = [FP · Fq n : Fq n ] = [Fq d · Fq n : Fq n ] d . = gcd(d, n) (iii) We have f (Q|P ) = [RQ : FP ] = [FP · Fq n : FP ] = [Fq d · Fq n : Fq d ] n = . 6). 2 Algebraic Varieties This chapter is devoted to the fundamentals of algebraic geometry.

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Algebraic Geometry in Coding Theory and Cryptography by Harald Niederreiter


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